If all this is confusing and you don't want to deal with installing Blend, then all you have to do is reference DLLs in the Libraries folder where the toolkit is installed (usually %ProgramFiles%\SimpleMvvmToolkit ...). The Blend DLL's are placed there
for your convenience. That said, I would suggest installing Blend if you can, because then those DLL's will be in referenced assemblies and you won't have to add them to each project.